[issue12981] rewrite multiprocessing (senfd|recvfd) in Python

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> - if the ancillay data is truncated, struct.unpack will raise an exception

Well, the current C code doesn't check that the data is truncated and it 
works correctly, so I don't think that it would be different in Python. 
And yes, Python adds an extra check thanks to struct.unpack.

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